If you study psychology there is a very good chance that you will be introduced to the theory of cognitive dissonance. This robust theory suggests that a motivational state of inner tension is triggered by logically inconsistent ways of thinking.
Originally published in the Journal of Abnormal and Social Psychology in 1959, Cognitive Consequences of Forced Compliance by Leon Festinger and James Carlsmith was the first of numerous studies to corroborate the theory of cognitive dissonance. The premiss for this classic piece of research was to address the question 'What happens to a person's private opinion if he is forced to do or say something contrary to that opinion?'
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You can download a free full-text PDF of Leon Festinger and James Carlsmith's classic 'cognitive dissonance' article via the following link.